Wafer-level substrate-free YIG single crystal film for a broadband tunable terahertz isolator

太赫兹辐射 材料科学 薄脆饼 隔离器 光电子学 宽带 基质(水族馆) 光隔离器 光学 太赫兹超材料 电子工程 激光器 远红外激光器 海洋学 物理 工程类 地质学
作者
Xilai Zhang,Dan Zhao,Ding Zhang,Qiang Xue,Fei Fan,Yulong Liao,Qinghui Yang,Qiye Wen
出处
期刊:Photonics Research [The Optical Society]
卷期号:12 (3): 505-505 被引量:3
标识
DOI:10.1364/prj.509876
摘要

Yttrium iron garnet (YIG) is a promising material for various terahertz applications due to its special optical properties. At present, a high-quality YIG wafer is the desire of terahertz communities and it is still challenging to prepare substrate-free YIG single crystal films. In this work, we prepared wafer-level substrate-free La:YIG single crystal films, for the first time, to our knowledge. Terahertz optical and magneto-optical properties of La:YIG films were characterized by terahertz time domain spectroscopy (THz-TDS). Results show that the as-prepared La:YIG film has an insertion loss of less than 3 dB and a low absorption coefficient of less than 10 cm −1 below 1.6 THz. Benefitting from the thickness of the substrate-free YIG films and low insertion loss, their terahertz properties could be further manipulated by simply using a wafer-stacking technique. When four La:YIG films were stacked, there was an insertion loss of less than 10 dB in the range of 0.1−1.2 THz . The Faraday rotation angle of the four-layer-stacked La:YIG films reached 19°, and the isolation could reach 17 dB. By further increasing the stacking number to eight pieces, a remarkable Faraday rotation angle of 45° was achieved with an isolation of 23 dB, which is important for practical application in the THz band. This material may provide a milestone opportunity to make various non-reciprocal devices, such as isolators and phase shifters.
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